CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
MiniTool Power Data Recovery - MiniTool Power Data Recovery is a freemium data recovery tool that works quite well considering the basic version is the only free aspect of the app.
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.
Disk Drill by Cleverfiles - Recover any type of deleted files in Windows & Mac including Office documents, messages, and media files quickly and easily.
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode
RS Photo Recovery - Recover lost and deleted photos!